Island Divertors: Concepts and Status of Experimental and Modelling Results

TL;DRAbstract

Basic features of the island divertor concepts for low-shear advanced stellarators like W7-AS and W7X (intrinsic island divertors) and for high-shear heliotrons like CHS and LHD (local island divertors, LID) and first results for both concepts are shortly reviewed. The diverting fields of island divertors are either intrinsic (low-shear case) or externally imposed (high-shear case). The associated field perturbations are very small compared to tokamak poloidal field divertors, which explains the high flexibility of island divertor configurations, but sufficiently large to generate divertor-viable islands. Although the physics of island divertors is expected to be similar to that of tokamak poloidal field divertors, leading geometrical parameters significantly differ from those of comparable-size tokamaks. Furthermore, strong three-dimensional effects arise from toroidally discontinuous target plates. For both the intrinsic and local island divertor configurations, the island structure

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